Add HTTPS reverse proxy with self-signed 100-year cert

- Nginx reverse proxy with WebUI and REST API for configuration
- Self-signed SSL certificate with own CA (100 years validity)
- Domain-based and IP/port-based routing
- Docker setup with host network mode
- All settings configurable via .env

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.env.example

@@ -0,0 +1,17 @@
+# ============================================
+# HTTPS Proxy - Konfiguration
+# ============================================
+
+# --- Zertifikat-Einstellungen ---
+CERT_COUNTRY=DE
+CERT_STATE=Bavaria
+CERT_CITY=Munich
+CERT_ORG=MyOrganization
+CERT_OU=IT
+CERT_CN=proxy.local
+CERT_DAYS=36500
+
+# --- WebUI-Einstellungen ---
+WEBUI_PORT=8443
+WEBUI_USERNAME=admin
+WEBUI_PASSWORD=admin123